Strep Throat vs Viral Sore Throat: How to Tell the Difference in Adults
Written by Naurah Gaspard, DNP, FNP-C, FNP-BC · Medically reviewed by Cherlie Joseph, MSN, FNP-BC · Updated November 2026
Most sore throats in adults are caused by viruses and get better in about a week without antibiotics. Strep throat causes only about 5 to 15% of adult sore throats. Strep is more likely with fever, swollen or white-spotted tonsils, tender neck glands and no cough, and a quick throat swab is the only way to confirm it.
In this guide
Why the difference matters
Strep throat is a bacterial infection caused by group A Streptococcus. It's treated with antibiotics, which shorten symptoms, lower the chance of spreading it, and help prevent rare complications such as an abscess near the tonsil or rheumatic fever.
Viral sore throats, from colds, flu, COVID or mononucleosis, don't respond to antibiotics. Taking antibiotics you don't need can cause diarrhea, yeast infections and allergic reactions, and it adds to antibiotic resistance. So the goal is to find the minority of sore throats that really are strep.
Strep vs viral: symptoms side by side
| Symptom | More likely strep | More likely viral |
|---|---|---|
| Cough | Usually absent | Common |
| Runny nose, hoarseness | Uncommon | Common |
| Fever | Often over 100.4°F | Low or none |
| Tonsils | Swollen, sometimes with white patches | Red, usually without patches |
| Neck glands | Swollen and tender in front of the neck | Mildly swollen or normal |
| Onset | Sudden, painful swallowing | Gradual, with cold symptoms |
| Other | Tiny red spots on the roof of the mouth, headache, stomach ache | Pink eye, mouth sores |
White patches alone don't prove strep; mono and some other viruses can cause them too. Mono is worth considering in younger adults with severe fatigue and swollen glands along the back of the neck.
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Start a sore throat visit →The Centor score: a quick strep check
Clinicians often use the Centor score to decide who needs a strep test. Give one point for each:
- Fever
- Swollen tonsils or tonsils with white patches (exudate)
- Tender, swollen lymph nodes in the front of the neck
- No cough
| Score | What it suggests | Usual next step |
|---|---|---|
| 0 to 1 | Strep unlikely | No test or antibiotics; home care |
| 2 to 3 | Strep possible | Rapid strep test; treat if positive |
| 4 | Strep likely | Test and treat, or treat based on symptoms |
The score is a guide, not a diagnosis. A provider also considers whether someone in your home has confirmed strep and how sick you feel.
Testing and treatment
Testing: A rapid strep test uses a throat swab and gives results in minutes. Many urgent care clinics and some pharmacies offer it, and a provider can order one at a local lab. In adults, a negative rapid test usually doesn't need a backup culture.
Treatment for strep: Penicillin or amoxicillin, usually for 10 days, is first choice. Penicillin resistance has not been documented in group A strep. For people with a penicillin allergy, options include cephalexin or, for severe allergy, clindamycin or azithromycin. Finish the full course even once you feel better. Most people stop being contagious after about 12 to 24 hours on antibiotics and feel noticeably better within 1 to 3 days.
Treatment for a viral sore throat: Rest, fluids, warm tea with honey, lozenges, saltwater gargles, and acetaminophen or ibuprofen as directed on the label. Most viral sore throats improve within 7 days.
When an online visit makes sense
An online visit can help you sort out whether your symptoms point more toward strep or a virus, get guidance on testing, and get a plan for relief. If your provider thinks you need a swab, they'll tell you where to get one. Because treatment depends on your symptoms and history, a prescription is never guaranteed, but you'll leave with a clear next step.
Get in-person care or call 911 if you have:
- Trouble breathing or noisy, high-pitched breathing
- Drooling or being unable to swallow saliva or liquids
- Unable to open your mouth fully, or a muffled "hot potato" voice
- Swelling on one side of the throat or neck
- Stiff neck, or a fever of 104°F or higher
- A sore throat lasting more than a week, or a new rash with fever
Frequently asked questions
Can you have strep throat without a fever?
Yes, though it's less common. Fever is one of the four Centor signs. Without fever, strep is less likely, but a provider may still suggest testing if you have other strong signs, such as swollen tonsils with white patches and tender neck glands.
Do white spots on the tonsils always mean strep?
No. Viral infections, including mono, can also cause white patches. A rapid strep test is the best way to tell.
How long is strep throat contagious?
People with strep are usually no longer contagious after about 12 to 24 hours of antibiotics, as long as they're fever-free. Without treatment, strep can stay contagious for a few weeks.
Sources
- AHRQ: Acute Pharyngitis Antibiotic Stewardship One-Pager
- CDC: Clinical Guidance for Group A Streptococcal Pharyngitis
Keep reading
- Cold vs Flu vs COVID: Symptoms Compared
- When to See a Doctor for a Cold
- Best Cold Medicine for Adults
- Browse all conditions and treatments A to Z
Sore throat and not sure if it's strep?
$79 visit, no appointment needed. Adults 18+ in FL, NM, OR and WA.
Start a sore throat visit →
Naurah Gaspard, DNP, FNP-C, FNP-BC
Board-certified family nurse practitioner licensed in Florida, New Mexico, Oregon and Washington, caring for adults online at OurTopClinic. Meet our providers.
This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.
